March 2013 - Boost-users - lists.preview.boost.org

Trying to cross compile Boost.Python using mingw
by Leonardo Sá 18 Mar '13

18 Mar '13

Hello all, I'm trying to cross compile boost python under linux to windows using the mingw32 compiler. Static linking works great, but when trying to make a dll, I get the following errors: gcc.link.dll bin.v2/libs/python/build/gcc-mingw-mingw32/release/target-os-windows/threadapi-win32/threading-multi/libboost_python-mt.dll.a /usr/bin/i686-w64-mingw32-ld: cannot find -lutil /usr/bin/i686-w64-mingw32-ld: cannot find -lpthread /usr/bin/i686-w64-mingw32-ld: cannot find -ldl collect2: ld returned 1 exit status My compile line is: b2 --with-system --with-date_time --with-python --with-filesystem --with-program_options -j 4 toolset=gcc-mingw32 target-os=windows threadapi=win32 variant=release --layout=tagged -sNO_BZIP2=1 -sNO_ZLIB=1 link=shared All the other libraries (system, date_time, program_options) generate dlls sucessfully. Any help is appreciated. Thanks!

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linker error when using from_simple_string()
by Phil Huffman 18 Mar '13

18 Mar '13

Hello, This line of code: date birthday(from_simple_string(s)); causes this error: Undefined symbols for architecture x86_64: "boost::gregorian::greg_month::get_month_map_ptr()", referenced from: unsigned short boost::date_time::month_str_to_ushort<boost::gregorian::greg_month>(std::string const&) in boost2-aLwtLt.o ld: symbol(s) not found for architecture x86_64 Any help will be appreciated. Thanks. Regards, Phil

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how to reuse a thread
by Victor Yankee 17 Mar '13

17 Mar '13

Hello, I would like to create a boost thread that can be reused to run a variety of functions each with different number of args of different types. I am using C++11 gnu compiler and so maybe a solution using variadics might work? I posted to here: http://stackoverflow.com/questions/15237426/can-a-thread-be-reused-to-run-v… But I am not understanding how. Thank you

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[boost] [arm] Building for ARM
by Michael Powell 17 Mar '13

17 Mar '13

Hello, I wonder, has anyone built Boost for ARM? Specifically, we've got an ARM5 for which I want to use Boost for many of those features, a key one is Spirit2 for at least one domain-specific-language (DSL) exposure, possibly two or three. That I can say, we're working with Mentor Graphics, Code Sourcery Code Bench for ARM for the moment. I think they've got current GCC language support through 4.7.2 if it matters. My only questions are, how feasible a cross compile is Boost? Does the inclusion and linkage go about as smoothly as for any other ARM-destined output? Thanks much in advance. Regards, Michael Powell

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[lexical_cast] Some code that was compiling in 1.50 stopped compiling in 1.53
by Alain Leblanc 17 Mar '13

17 Mar '13

Here's some code that has been compiling till at least 1.50, and starting long before. I isolated the part that breaks to create a program. Here it is: Just taking a std::vector of int and copying into strings. #include <boost/lexical_cast.hpp> #include <vector> #include <string> using namespace std; int main (int, char **) { vector<int> values; vector<string> ret; std::transform(values.begin(), values.end(), ret.begin(), boost::lexical_cast<std::string, int>); } And compiling on fedora 18, gcc 4.7 (Got same issues, I believe, with MSVC 10) I get the output at the bottom. Anyone has an idea on what the problem could be? Thanks, a [aleblanc@localhost base]$ gcc -c TestLexicalCast.cc [aleblanc@localhost base]$ gcc -c -I/home/aleblanc/local/boost_1_53/include/ TestLexicalCast.cc TestLexicalCast.cc: In function ‘int main(int, char**)’: TestLexicalCast.cc:10:98: error: no matching function for call to ‘transform(std::vector<int>::iterator, std::vector<int>::iterator, std::vector<std::basic_string<char> >::iterator, <unresolved overloaded function type>)’ TestLexicalCast.cc:10:98: note: candidates are: In file included from /usr/lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/algorithm:63:0, from /home/aleblanc/local/boost_1_53/include/boost/utility/swap.hpp:24, from /home/aleblanc/local/boost_1_53/include/boost/swap.hpp:10, from /home/aleblanc/local/boost_1_53/include/boost/array.hpp:45, from /home/aleblanc/local/boost_1_53/include/boost/lexical_cast.hpp:158, from TestLexicalCast.cc:1: /usr/lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/bits/stl_algo.h:4940:5: note: template<class _IIter, class _OIter, class _UnaryOperation> _OIter std::transform(_IIter, _IIter, _OIter, _UnaryOperation) /usr/lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/bits/stl_algo.h:4940:5: note: template argument deduction/substitution failed: TestLexicalCast.cc:10:98: note: could not resolve address from overloaded function ‘lexical_cast<std::string, int>’ In file included from /usr/lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/algorithm:63:0, from /home/aleblanc/local/boost_1_53/include/boost/utility/swap.hpp:24, from /home/aleblanc/local/boost_1_53/include/boost/swap.hpp:10, from /home/aleblanc/local/boost_1_53/include/boost/array.hpp:45, from /home/aleblanc/local/boost_1_53/include/boost/lexical_cast.hpp:158, from TestLexicalCast.cc:1: /usr/lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/bits/stl_algo.h:4977:5: note: template<class _IIter1, class _IIter2, class _OIter, class _BinaryOperation> _OIter std::transform(_IIter1, _IIter1, _IIter2, _OIter, _BinaryOperation) /usr/lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/bits/stl_algo.h:4977:5: note: template argument deduction/substitution failed: TestLexicalCast.cc:10:98: note: could not resolve address from overloaded function ‘lexical_cast<std::string, int>’ [aleblanc@localhost base]$

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[interprocess] message_queue has non const get_num_msg(). Why?
by Gábor Márton 16 Mar '13

16 Mar '13

In 1.53, get_num_msg() is non const. Does it really modify the object? Thanks, Gabor

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[fusion] Defining pixel formats
by Christian Henning 16 Mar '13

16 Mar '13

Hi all, ever since Jang Tongary suggested to use boost::fusion to define pixel types I wondered what he meant by that. I never had the opportunity to get myself familiar with fusion so I started learning it and I'm really amazed how easy the library is to use. I think I'm at a point where I would like to reach to the community for some advice. Let's say I wanna create a homogeneous three channel pixel type, like RGB. For that I would use a fusion map since I want to access channel by name. I also would like to be able to swap channels around to create BGR. How would I do that? namespace boost { namespace gil_3 { struct red_t; struct green_t; struct blue_t; } } // namespace boost::gil_3 void foo() { typedef fusion::map< fusion::pair< gil_3::red_t , boost::uint8_t > , fusion::pair< gil_3::green_t, boost::uint8_t > , fusion::pair< gil_3::blue_t , boost::uint8_t > > rgb8_pixel_t; // not working typedef fusion::reverse_view< rgb8_pixel_t >::type bgr8_pixel_t; rgb8_pixel_t a( 10, 20, 30 ); bgr8_pixel_t b( 30, 20, 10 ); boost::uint8_t red_a = fusion::at_key< gil_3::red_t >( a ); boost::uint8_t red_b = fusion::at_key< gil_3::red_t >( b ); } Thanks! Christian

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[MPL] How to use a mpl::map
by Daniele Barzotti 15 Mar '13

15 Mar '13

Hi, I'm new to MPL and I have difficulties to use the map container. I need to map (and then retrieve) some types based on they ID: I try the following code but it does not work.. sturct MSG_METHOD_CONNECT { .... } template<class MESSAGE> class PBMessage { public: PBMessage() {}; /* ... other methods ... */ private: MESSAGE m_Msg; }; // Map of types. The key is the Message opCode typedef typename mpl::map< mpl::pair<mpl::int_[100], PBMessage<MSG_METHOD_CONNECT> >, mpl::pair<mpl::int_[101], PBMessage<MSG_EVENT_CONNECT> >, > TMessageMap; // The Message type template < typename MessageMap, int opCode > typedef typename mpl::at<MessageMap, mpl::int_<opCode> >::type::value TMessage; And to retrieve the type: TMessage<TMessageMap, opCode> msg; Could someone give me some suggestions? Regards, Daniele.

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[serialization, archive] Serialize boost::shared_ptr to custom archive
by Silviu P 15 Mar '13

15 Mar '13

Hi, I'm trying to serialize a boost::shared_ptr to a custom archive. The compiler complains about the archive missing methods 'append' and 'reset'. Does anyone know where I should look to find out more information about these two methods? I wasn't able to find any documentation when looking at the Archive Concept about these two methods, and text_iarchive, together with its base classes, don't seem to declare it. On the other hand, boost::archive::text_iarchive compiles fine. Here are the compile errors I see: /usr/include/boost/serialization/shared_ptr.hpp:133:9: error: ‘class my_iarchive’ has no member named ‘append’ /usr/include/boost/serialization/shared_ptr.hpp:139:5: error: ‘class my_iarchive’ has no member named ‘reset’ My boost version is 1.46 (which comes with openSuse 12.1) Thank you in advance.

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[graph][PBGL] Remove edge broken reference
by Borja Miñano 15 Mar '13

15 Mar '13

Hello, I had a problem after removing some edges from my graph. I am using the graph_parallel library. And this problem did not happened me when using the serial one. I use a predicate to remove edges, and it seems to work, it deletes the local edges and the crossing edges (source local -> target ghost). But if after that I want to iterate over the in_edges The iterator returns references to edges that does not exists any more. For example, if I had 30 in_edges and the removing process eliminate 20, then the in_edge iterator iterates over 10, but with wrong references. Could anyone help debugging this problem? I think it might be an own problem, but I don't know how to check it. -- Un saludo, Borja Miñano IAC3 - Universitat de les Illes Balears ParcBit - Edifici 17 (Disset); Local D7 Cra. Valldemossa km. 7,4 E-07121 Palma de Mallorca. Balears. Spain. Phone: +34 871 967 434

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